Show him where the engines are on different types (i.e. .R22/R44/300C(Bi), 206, MD500, etc.). Show where the intakes are on turbines in order to be able to spray foam into them. I dunno. I imagine there is a company that could be contracted to do a training...
Perhaps a friendly reminder to airfield management that an airfield that has a fire department and allows heli ops will be liable if said FD doesn't know how to deal with heli-related emergencies.